Blackboard



No. 616,799. Patented Deb. 27,1998.

. M. D. L. MccoLLuM.

BLAcKBuAnn.

lication filed A r. 14

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um nwwwH f Il UNITED STATES PATENT OFFICE.

MARQUIS I). L. MCCOLLUM, OF WILLIAMSPORT, PENNSYLVANIA.

* VBLACKBOARDl SPECIFICATION forming part Vof Letters Patent No. 616,799, dated December 27, 1898. Application filed April 14,1896. Serial No. 587,449. (No model.)

To all whom t 71mg/ concern:

Be it known that I, MARQUIS D. L. MGOOL- LUM, of Williamsport, county of Lycoming, State of Pennsylvania., have invented certain new and useful Improvements in Blackboards, of which the following is a specification, reference being had to the accompanyingdrawings.

The object of my invention is toproduce anv improved blackboard having a plurality of swinging leaves adapted to revolve upon a central support and so arranged that any one of the leaves may be brought into a ixed position for writing upon it vand by which all of the leaves may be turned independently to exhibit both surfaces thereof, respectively.

I propose to employ my blackboard especially as an advertising` medium, and it is constructed with a view of rendering it serviceable both as a blackboard and to render it available for the purpose of exhibiting advertisements displayed upon its several leaves.

In the accompanying drawings, Figure I is a side elevation of my board complete, showing two leaves in fixed positions, in which they may be utilized as blackboards, the remaining leaves being adapted to move freely from side to side as means for exhibiting the advertising upon them. Fig. II is a top plan view of the same.

Referring to the figures on the drawings, 1 indicates any suitable stand or pedestal provided with a shoulder 2, above Awhich projects a spindle 3. The spindle should be of suitable length to accommodate blackboardleaves of the desired height.

4 indicates a bottom plate, and 5 an upper plate, provided with central apertures 6 and 7, respectively, and designed to fit loosely upon the spindle 3. The plates 4 and 5 are preferably disk-shaped and are provided with a circular series of apertures 8 and 9, respectively, each aperture in the plate 4 being opposite an aperture in the plate 5.

11 indicates one of the blackboard-leaves, of which there may be an indeiinite number,

' proportionate to their size and the size of the plates 4 and 5. They are preferably made of light material, such as wood, pulp, or the like, and are designed to display a blackboardesurface 13, arranged, for example, in the cen ter, and a margin, containing advertisements.

Any desirable relations between the blackboard-space and the advertising-space may be substituted for that illustrated.

Each of the boards l1 is provided at two of its corners with hinges, which preferably consist of an overlapping part 14, that forms a secure union for the hinge with the board, and with a strap projection 15, extending flush with the upper surface of the overlapping part 14. Thestraps 15 are inserted between the plates 4 and 5, respectively, and are secured in opposite apertures therein, as by means of rivets 16. Vhen all of the leaves are in place, and thus secured to the plates, the two plates form, in edect, a supportingframe which is held in position by the spindle 3, the lower plate 4 resting upon the shoulder 2.

By means of the construction illustrated any two of the leaves may be brought into alinement successively, the remaining leaves being allowed to swing freely behind the two fixed leaves, as is clearly shown in the draw ings.

' For the purpose of securing certain leaves in the fixed position I prefer to provide a transverse support 17, secured to the stand 1 directly underneath the plate 4. Upon the ends of this support I provide retaining members, which may consist of ordinary pivoted pieces 18, provided, respectively, with grooved ends 19, proportioned to the thickness of the leaves which they are to hold.

I propose to provide the transverse support 17 with a chalk-rack 20. The retaining-pieces 18 should be located upon the support so as to bring two of the leaves into alinement, and, as illustrated, they are fastened upon the outer edge of the chalk-rack. By this arrangement the chalk-rack is covered and protected by the retained leaves, so that its contents are prevented from being accidentally dislodged and scattered about.

It is obvious that more than one transverse support, with the retaining-pieces, may be employed, so that the surfaces of four leaves may be held into position for writing upon them at one time; but this is a matter of duplication, which may be resorted to or not, as preferred.

1. The combination with a stand, revolving frame and swingingleaves thereon, of a chalk- IOO so as to come underneath the leaves and be Ic protected thereby, substantially as set forth.

In testimony of all which I have hereunto subscribed my name.

MARQUIS D.'L. MCCOLLUM.

Witnesses:

JUSTIN L. I-IILL, OTTO G. KAUPP. 

